Mike Holt

NEC Trainer / Consultant,
Mike Holt Enterprises

Mike earned a masters degree in the Business Administration Program (MBA) from the University of Miami. He earned his reputation as a National Electrical Code (NEC) expert by working his way up through the electrical trade. Formally a construction editor for two different trade publications, Mike started his career as an apprentice electrician and eventually became a master electrician, an electrical inspector, a contractor, and an educator. Since 1975, he has provided custom in-house seminars for groups such as IAEI, NECA, ICBO, IBM, AT&T, Motorola, and the U.S. Navy. Mike has taught more than 1,000 classes on 30 different electrical-related subjects — ranging from alarm installations to exam preparation and voltage drop calculations. He continues to develop seminars, videos, books, and software as well as contributing monthly Code content to EC&M magazine.

Code Q&A
Q. Must receptacles be installed so they can be removed without interrupting the power to any downstream receptacles? A. Continuity of the grounded neutral conductor of a multiwire branch circuit must not be interrupted by the removal of a wiring ...
Code Q&A
Q. Does the NEC restrict the placement of a light switch in a bathroom? What about pools, spas, and hot tub areas? A. Switches can be located next to, but not within, a bathtub, hydromassage bathtub, or shower space (404.4 and 680.70 and 680.72). ...
Grounding vs Bonding — Part 6 of 12
How solid is your understanding of grounding electrode systems?
Code Q&A
Q. Does the Code require an electric motor driven fire pump to be connected to a standby generator if a standby generator is installed on the premises? A. Power to fire pump motors must be supplied by a reliable source of power (695.3) that has the ...
Code Q&A
Q. Can I terminate two wires on a single-pole circuit breaker? A. Yes, if the terminal is identified for two conductors, either within the equipment instructions or on the terminal itself. It’s my understanding that only Square D circuit breakers (15A, ...
Code Quandaries
Stumped by the Code?
Grounding vs Bonding — Part 5 of 12
Do you know the right way to ground and bond buildings or structures supplied by feeders or branch circuits?
Code Q&A
Q. Does the Code limit the total ampere rating of all circuit breakers in a panel? For example, could the total ampere rating of all circuit breakers in a 100A panel exceed 100A? A. This isn’t a Code issue. The sum of the ampere rating of the circuit ...
Code Q&A
Q. What’s the maximum number of circuit breakers permitted to be installed in a panel? A. The maximum number of circuit breakers permitted in a panelboard is limited by the instructions posted inside the panelboard . In addition, 408.15 specifies that a ...
Grounding vs Bonding — Part 4 of 12
People often forget that all transformers, except autotransformers, are separately derived
Code Q&A
Q. What outlets in a dwelling unit are required to be AFCI protected? A. All 15A or 20A, 120V branch circuits that supply outlets in dwelling unit bedrooms must be protected by a listed AFCI device . According to Art. 100, an outlet is a point in the ...
Code Q&A
Q. Must metal siding and metal framing members be grounded? A. The NEC doesn’t specifically require metal siding or metal framing members to be bonded (not grounded) to an effective ground-fault current path . However, exposed structural metal that ...
Grounding vs Bonding — Part 3 of 12 1
Grounding and bonding at service equipment
Code Quandaries 1
Q. What is the maximum number of 15A or 20A, 125V receptacle outlets permitted on a 20A, 120V general-purpose branch circuit in a commercial occupancy?
Code Q&A
Q. I’ve been looking online, but I can’t seem to find a consistent answer on whether a television antenna placed in the attic needs to be grounded. Does it? A. No. Each lead-in conductor from an outdoor antenna must be provided with a listed antenna ...

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